JP6963926B2 - Reinforced concrete structure - Google Patents

Description

The present invention relates to a reinforced concrete structure.

There is a reinforced concrete structure including a column, a flat beam having a width dimension larger than that of the column, and an overhanging portion that protrudes from the column and intersects the flat beam at the intersection of the column and the flat beam (for example, Patent Document 1). ..

JP-A-2015-140635

As shown by the white arrows in FIG. 15, when a seismic force acts on the columns 120 and the flat beams 130, the overhanging portion 140 protruding from the columns 120 has the flat beams 130 as shown by the straight arrows in FIG. Bending stress and shear stress are input from. As a result, torsional stress as shown by the white arrow in FIG. 16 is generated on the joint surface 150 (shaded in FIG. 16) between the column 120 and the overhanging portion 140. As a result, the overhanging portion 140 may be excessively twisted or cracked 160 as shown in FIG. An object of the present invention is to provide a reinforced concrete structure having a large resistance to torsional stress of an overhanging portion protruding from a column and intersecting a beam.

The reinforced concrete structure that solves the above-mentioned problems includes a column, a beam having a width larger than that of the column, and an overhanging portion that protrudes from the column and intersects the beam at the intersection of the column and the beam. The overhanging portion has a larger thickness than the beam.

According to the present invention, it is possible to provide a reinforced concrete structure having a large resistance to torsional stress of an overhanging portion protruding from a column and intersecting a beam.

The perspective view which shows the basic structure of embodiment of a reinforced concrete structure. The perspective view explaining the operation of the structure of FIG. A perspective view when the configuration of FIG. 1 is applied to an apartment house. FIG. 3 is a plan sectional view of the configuration of FIG. The perspective view which shows the 1st modification example of a reinforced concrete structure. FIG. 5 is a plan sectional view of the configuration of FIG. The perspective view which shows the 2nd modification example of the basic structure of a reinforced concrete structure. FIG. 5 is a perspective view illustrating the operation of the configuration of FIG. 7. The perspective view which shows the 3rd modification example of the basic structure of a reinforced concrete structure. The perspective view explaining the operation of the structure of FIG. The perspective view which shows the 4th modification example of the basic structure of a reinforced concrete structure. The perspective view explaining the operation of the structure of FIG. The perspective view which shows the 5th modification example of the basic structure of a reinforced concrete structure. FIG. 3 is a perspective view illustrating the operation of the configuration of FIG. 13. The perspective view which shows the basic structure of the conventional reinforced concrete structure. The perspective view explaining the force generated when the seismic force acts on the structure of FIG.

Hereinafter, embodiments of the reinforced concrete structure will be described with reference to the drawings.
As shown in FIG. 1, the reinforced concrete structure 11 of the present embodiment has a column 12, a beam 13 having a width larger than that of the column 12, and an overhanging portion protruding from the column 12 at the intersection of the column 12 and the beam 13. 14 and. The overhanging portion 14 is formed so that the thickness dimension is larger than that of the beam 13.

The width dimension is the length in the width direction (X-axis direction in the figure) of the beam 13, and the thickness dimension is the length in the gravity direction (Z-axis direction in the figure). The Y-axis in the figure is orthogonal to both the X-axis and the Z-axis. The Y-axis direction is the extension direction of the beam 13. The overhanging portion 14 of the present embodiment projects according to the width of the beam 13, but the overhanging portion 14 may project beyond the width of the beam 13 as long as it can support the beam 13 (see FIG. 5). ..

The overhanging portion 14 preferably has an upper protruding portion 14A projecting upward from the upper surface 13a of the beam 13 and a lower projecting portion 14B projecting downward from the lower surface 13b of the beam 13. In this case, it is preferable that the upper protrusion 14A and the lower protrusion 14B have the same protrusion length in the vertical direction (Z-axis direction).

Next, the operation of this embodiment will be described.
When the seismic force indicated by the white arrow in FIG. 1 acts on the column 12 and the beam 13, the overhanging portion 14 protruding from the column 12 receives the bending stress and the shear stress indicated by the straight arrow in FIG. 2 from the beam 13. input.

As a result, as shown by the white arrows in FIG. 2, torsional stress is generated on the joint surface 15 (shaded in FIG. 2) between the column 12 and the overhanging portion 14. Since the overhanging portion 14 has a larger thickness than the beam 13, the area of the joint surface 15 between the column 12 and the overhanging portion 14 is large. When the area of the joint surface 15 serving as the torsional resistance surface is large, the resistance force against the torsional stress becomes large, so that torsional deformation and torsional fracture are unlikely to proceed.

The reinforced concrete structure 11 shown in FIGS. 3 and 4 is an apartment house, and the beam 13 constitutes a part of the floor 21 of the balcony 20. As shown in FIG. 4, the reinforced concrete structure 11 includes an outer wall 23 that separates the interior and the outside, and a glass door 25 fitted in the opening of the outer wall 23, and the pillar 12 is arranged along the outer wall 23. Will be done. Further, on the balcony 20, a partition plate 22 for partitioning the site of each house is arranged at a position outside the pillar 12.

From the pillar 12 in contact with the outer wall 23, the overhanging portion 14 projects toward the outside of the room. In this case, since the upper protruding portion 14A constitutes the floor 21 of the balcony 20, the living space in the room is not narrowed. When the upper protruding portion 14A is arranged below the partition plate 22, it is less likely to get in the way even on the balcony 20. Further, since the lower protruding portion 14B (not shown) is located on the roof portion of the balcony 20, it is less likely to get in the way.

According to this embodiment, the following effects can be obtained.
(1) Since the thickness dimension of the overhanging portion 14 is larger than that of the beam 13, the joint surface 15 between the overhanging portion 14 and the column 12 becomes larger. Therefore, the overhanging portion 14 has a large resistance to torsional stress.

(2) The upper protruding portion 14A and the lower protruding portion 14B increase the joint surface 15 in a well-balanced manner in the vertical direction.
(3) When the pillar 12 is viewed from the outside of the balcony 20, the overhanging portion 14 has the same outer edge as the pillar 12, so that the appearance is not spoiled.

(Change example)
The above embodiment may be modified as in the modification shown below. The configuration included in the above embodiment can be arbitrarily combined with the configuration included in the following modification example. The configurations included in the following modification examples can be arbitrarily combined.

As in the first modification shown in FIGS. 5 and 6, the reinforced concrete structure 11 has a column 12 arranged on the balcony 20 and an overhanging portion 14 projecting from the column 12 toward the outer wall 23. You may. The beam 13 intersecting the pillar 12 constitutes a part of the floor 21 of the balcony 20.

As shown in FIG. 6, an evacuation hatch 24 may be arranged on the floor 21 of the balcony 20. Even when the wide beam 13 constitutes the floor 21 of the balcony 20, if the floor 21 of the balcony 20 is widened by inserting a part of the outer wall 23 and the glass door 25 into the indoor side, the floor 21 of the balcony 20 is inside the beam 13. The evacuation hatch 24 can be placed in.

As in the second modification shown in FIGS. 7 and 8, the reinforced concrete structure 11 penetrates the column 12, the overhanging portion 14, and the joint surface 15 in the width direction (in the column 12 and in the overhanging portion 14). A reinforcing member 16 extending in the X-axis direction) may be provided. The reinforcing member 16 may be, for example, a shaped steel such as an H-shaped, an I-shaped or angle-shaped steel, or a steel plate, a steel pipe or a reinforcing bar. In this configuration, the reinforcing member 16 increases the resistance to torsional stress.

As in the third modification shown in FIGS. 9 and 10, the upper protruding portion 14A and the lower protruding portion 14B may have a longer length in the extending direction (Y-axis direction) than the pillar 12. Then, the area of the joint surface 15 of the present embodiment is expanded in the vertical and horizontal directions as compared with the joint surface of the conventional example (shown by the alternate long and short dash line in FIG. 10). In this case, it is preferable that the joint surface 15 between the overhanging portion 14 and the pillar 12 has the same aspect ratio. Increasing the joint surface 15 increases the resistance to torsional stress. In particular, when the aspect ratios of the joint surfaces 15 are equal, it is possible to efficiently resist torsional stress.

-As in the fourth modification shown in FIGS. 11 and 12, the reinforced concrete structure 11 may include two overhanging portions 14 projecting from both sides in the width direction (X-axis direction) of the columns 12. In this case, since there are two joint surfaces 15 between the column 12 and the overhanging portion 14, the resistance to torsional stress is increased.

-As in the fifth modification shown in FIGS. 13 and 14, the column 12 of the reinforced concrete structure 11 may have a flat shape having a length in the extension direction (Y-axis direction) longer than the width dimension. In this way, the length of the column 12 in the extending direction (Y-axis direction) becomes longer, and the joint surface 15 with the overhanging portion 14 becomes larger, so that the resistance to torsional stress becomes larger.

The overhanging portion 14 may be formed in a columnar shape so that the cross section becomes circular when cut on a cut surface orthogonal to the X axis. The joint surface 15 of the columnar overhanging portion 14 can be made larger by increasing the diameter of the column 12 in the extending direction (Y-axis direction) and the thickness dimension of the beam 13. In addition, the overhanging portion 14 can have an arbitrary shape such that the cross section becomes a polygon such as a hexagon or an ellipse when cut at a cut surface orthogonal to the X axis.

The overhanging portion 14 may project only from one of the upper surface 13a and the lower surface 13b of the beam 13, and may not project from the other surface.
-The beam 13 is not limited to a flat beam whose width dimension is longer than the thickness dimension, and if the width dimension of the beam 13 is larger than that of the column 12, the width dimension and the thickness dimension of the beam 13 may be equal to each other. The width dimension of 13 may be shorter than the thickness dimension.

The technical idea and its action and effect grasped from the above-described embodiment and modification are described below.
[Thought 1]
Pillars and
A beam with a width larger than that of the column,
An overhanging portion that protrudes from the pillar and intersects the beam at the intersection of the pillar and the beam.
With
The overhanging portion is a reinforced concrete structure characterized in that the thickness dimension is larger than that of the beam.

According to this configuration, the joint surface between the overhanging portion and the column becomes larger because the thickness dimension of the overhanging portion is larger than that of the beam. Therefore, the resistance to the torsional stress of the overhanging portion is large.
[Thought 2]
The reinforced concrete structure according to [Concept 1], wherein the overhanging portion has an upper protruding portion protruding upward from the upper surface of the beam and a lower protruding portion protruding downward from the lower surface of the beam. thing.

According to this configuration, the upper protruding portion and the lower protruding portion increase the joint surface between the overhanging portion and the column in a well-balanced manner in the vertical direction.
[Thought 3]
The structure according to [Thought 1] or [Thought 2], wherein the joint surface between the overhanging portion and the pillar has the same aspect ratio.

According to this configuration, since the aspect ratios of the joint surfaces are equal, the overhanging portion can efficiently resist torsional stress.
[Thought 4]
The structure according to any one of [Thought 1] to [Thought 3], characterized in that a reinforcing material extending in the width direction is provided in the pillar and in the overhanging portion.

According to this configuration, the reinforcing material increases the resistance to torsional stress.
[Thought 5]
The structure according to any one of [Thought 1] to [Thought 4], wherein the overhanging portion protrudes from both sides in the width direction of the pillar.

According to this configuration, since there are two joint surfaces between the column and the overhanging portion, the resistance to torsional stress is increased.

11 ... Reinforced concrete structure, 12 ... Pillar, 13 ... Beam, 13a ... Upper surface, 13b ... Lower surface, 14 ... Overhang, 14A ... Upper protruding part, 14B ... Lower protruding part, 15 ... Joint surface, 16 ... Reinforcing material, 20 ... balcony, 21 ... floor, 22 ... divider, 23 ... outer wall, 24 ... evacuation hatch, 25 ... glass door.

Claims (5)

Pillars and
A beam with a width larger than that of the column,
An overhanging portion that protrudes from the pillar and intersects the beam at the intersection of the pillar and the beam.
With
The overhanging portion has at least the upper protruding portion of the upper protruding portion protruding upward from the upper surface of the beam and the lower protruding portion protruding downward from the lower surface of the beam, and has a thickness dimension more than that of the beam. Reinforced concrete structure characterized by its large size. The overhang, reinforced concrete structure according to claim 1, characterized in that it comprises a front SL upper-side projection, and the front Symbol lower protruding portion. The reinforced concrete structure according to claim 1 or 2, wherein the joint surface between the overhanging portion and the column has the same aspect ratio. The reinforced concrete structure according to any one of claims 1 to 3, further comprising a reinforcing material extending in the width direction in the column and the overhanging portion. The reinforced concrete structure according to any one of claims 1 to 4, wherein the overhanging portion projects from both sides in the width direction of the column.

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